Alarm apparatus.



L. B. DAVIS.

ALARM APPARATUS. APPLICATION mm JUNE 13. I916.

Patented June 12, 1917.

2 SHEETS-SHEET L L. B. DAVIS.

ALARM APPARATUS.

APPLICATION FILED JUNE I3, 1916.

I 1,229,723. 4 Patentedlune12,1917.

2 SHEETS-SHEET 2- gwwm rm 11071793;

} Q I attoznm LORING B. DAVIS, OF RENO, NEVADA.

ALARM APPARATUS.

Specification of Letters Patent.

Patented June 12, 1917.

Application filed June 13, 1916. Serial No. 103,469.

To all whom it may concern:

Be it known that I, LORING B. DAVIS, a citizen of the United States, residing at Reno, in the county of Washoe and State of Nevada, have invented certain new and useful Improvements in Alarm Apparatus; and

I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters and figures of reference marked thereon, which form a part of this specification.

This invention relates to new and useful improvements in signal or alarm apparatus actuated by clockwork mechanism and consists of a simple and efficient apparatus of this nature so arranged that it may be set to go off at a predetermined moment and ring an alarm.

The invention comprises various details of construction, combinations and arrangements of parts which will be hereinafter fully described, shown in the accompanying drawings and then specifically defined in the appended claim.

I illustrate my invention in the accompanying drawings, in which Figure l is an elevation of the dial of a casing, parts being broken away to show the alarm mechanism.

Fig. 2 is a side elevation.

Figs. 3 and 4 are detail perspective views of parts of the apparatus.

Reference now being had to the details of the drawings by letter, A designates a disk upon which the alarm mechanism is mounted. G designates a casing upon which the dial appears and incloses the entire alarm mechanism. A post E, rotated by a spring 13 of the escapement clockwork mechanism,

.passes through the wall of the casing and has a pointer K fastened thereto, movable over the dial upon the casing. It will be understood that the clockwork with escapement mechanism is of the ordinary type and that further detailed description of the same is deemed unnecessary. Sufiice it to say that, when the pointer is thrown to the right in a clockwise direction, it will tend to wind up the spring of the clockwork escapement mechanism and, when released, said pointer will return toits normal starting position and in its movement cause alarm mechanism to be actuated. -A bar L is also fastened to sound the latter.

the post E and has a laterally extending finger 0 near its free end. Mounted upon a bracket member M upon the wall of the casing is a leaf spring'Q widened as at Q and which is disposed in the path of the laterally extending finger O. Said spring Q is curved as shown and, when the finger 0 comes against the free end of the spring Q at Q, said spring Q will be moved toward the center of the disk out of its normal position. A second leaf spring, designated by letter R, isfastened to the spring Q and has a hammer S secured to its free end. After the finger O has passed by the widened portion Q, said spring will vibrate and cause the hammer to strike against the bell F and I A spring W projecting from the disk A, as shown in Figs. 1 and 2 of the drawings, serves to limit the outer throw of the hammer S and confines the vibrating movement to a given space, causing the bell F to ring for a certain duration. A

plate J is pivotally mounted upon the disk A and has a swinging movement limited by the angled portion of the strap I, which projects from the disk A, and a pin J 2 extending laterally from the plate against which the end of the bar Lis adapted to extend its movement in either direction. llhis imped-iment to the bar L on its return movement will cause the spring motor to stop immediately after the finger 0 passes Q and the bell rung, also allowing the pointer K to register at zero when swung to its limit and also at zero when it returns, and bell rings and mechanism stops. I

In operation, the bell will not ring unless pointer K is swung to a numeral greater than three minutes, thus allowin the finger O to pass beyond the point and the widened portion of the leaf spring Q. The speed of the pointer K and bar L and the whole mechanism of the alarm apparatus is controlled and regulated by the usual escapement controlling the movements of the spring-pressed post upon which the pointer is mounted. To operate the device, the alarm is set to ring at any time designated upon the dial exceeding three minutes. This is accomplished by moving the pointer to the right and, when opposite any numeral or division intermediate the numerals, designating the number of minutes within which it is desired to have the alarm sounded, the operator releases the pointer, allowing the spring-pressed shaft carrying the pointer leaf spring mounted within the casing and to be returned to its normal position, being regulated by the escapement mechanism. From the foregoing, it will .be noted that each time the pointer K is moved to the right, the coiled spring B is proportionately tensioned and the device is normally set and wound by one movement or operation, that is lay the movement of the pointer to the ri t.

at I claim to be new is An alarm apparatus, comprising a springpressed rotatable post with clockwork escapement mechanism regulating the same, a pointer fixed to said post and movable over the dial, a bell, a bar secured to the post and having a lateral projection, a curved having a portion thereof in the path of said projection'whereby the leaf spring is moved toward the center of the casing as the 20 pointer returns to its normal position, a.

ammer upon the free end of said leaf spring adapted to vibrate against the bell after the projection upon said bar passes beyond the free end of the leaf sprin and 23 means for limiting the movement 0 said pointer and bar in either direction.

In testimony whereof I hereunto affix my signature in presence of two witnesses.

v LORING B. DAVIS. Witnesses:

FRANK D. KING, A. O. PERCY. 

